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* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
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package com.sun.jersey.server.impl.cdi;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
import jersey.repackaged.org.objectweb.asm.ClassWriter;
import jersey.repackaged.org.objectweb.asm.MethodVisitor;
import jersey.repackaged.org.objectweb.asm.Opcodes;
/**
* Generates any number of plain bean classes on the fly, loading them with
* the thread context class loader.
*
* Generated bean classes have a single, public, no-arg constructor.
*
* @author robc
*/
public class BeanGenerator {
private static final Logger LOGGER = Logger.getLogger(CDIExtension.class.getName());
private String prefix;
private Method defineClassMethod;
private static AtomicInteger generatedClassCounter = new AtomicInteger(0);
BeanGenerator(String prefix) {
this.prefix = prefix;
try {
defineClassMethod = AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Method run() throws Exception {
Class classLoaderClass = Class.forName("java.lang.ClassLoader");
Method method = classLoaderClass.getDeclaredMethod("defineClass", new Class[]{String.class, byte[].class,
int.class, int.class});
method.setAccessible(true);
return method;
}
});
} catch (PrivilegedActionException e) {
LOGGER.log(Level.SEVERE, "failed to access method ClassLoader.defineClass", e);
// TODO - wrapping and rethrowing for now
throw new RuntimeException(e);
}
}
Class createBeanClass() {
ClassWriter writer = new ClassWriter(0);
String name = prefix + Integer.toString(generatedClassCounter.addAndGet(1));
writer.visit(Opcodes.V1_6, Opcodes.ACC_PUBLIC, name, null, "java/lang/Object", null);
MethodVisitor methodVisitor = writer.visitMethod(Opcodes.ACC_PUBLIC, "", "()V", null, null);
methodVisitor.visitCode();
methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "", "()V");
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitMaxs(1, 1);
methodVisitor.visitEnd();
writer.visitEnd();
byte[] bytecode = writer.toByteArray();
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
try {
Class result = (Class) defineClassMethod.invoke(classLoader, name.replace("/", "."), bytecode, 0,
bytecode.length);
LOGGER.fine("Created class " + result.getName());
return result;
} catch (Throwable t) {
LOGGER.log(Level.SEVERE, "error calling ClassLoader.defineClass", t);
return null;
}
}
}
